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Could I ask what size sprockets you are using? I've seen several road bikes on that well known auction site with blown motors, it's plain to see they've all had the big 56 tooth rear sprocket. So they've been used on the road for several thousand miles at 8000rpm, no wonder the motor's given up the ghost. You've given us all the clues, it stopped suddenly with a lot of noise while being ridden at speed, and now won't start. In my experiance that's terminal.
Jonathan.
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